void testApp::generateVBOs() {
// If the meshes have already been generated once, we need to clear their data
vboMeshOriginal.clear();
vboMeshMirrored.clear();
// Shorthand to make the equations more readable
// r is the radius of a circle that is inscribed by the display window
// a is the current angle heading we will use to sample the image
// da is half the span of the triangle
float r = minWindowDimension/2.0;
float a = ofDegToRad(imageSectionHeading);
float da = ofDegToRad(triangleAngularWidth/2);
// Define the vertices of the triangular face
ofVec3f triangleBottom(0, 0, 0);
ofVec3f triangleLeft(r*cos(a+da), -r*sin(a+da), 0); // Flip because of drawing
ofVec3f triangleRight(r*cos(a-da), -r*sin(a-da), 0); // Flip because of drawing
float cx = imageSectionCenter.x;
float cy = imageSectionCenter.y;
r = minImageDimension/2.0;
// Define the triangular section of the image that we want to draw on the face
ofVec2f textureBottom(cx, cy);
ofVec2f textureLeft(cx+r*cos(a+da), cy-r*sin(a+da));
ofVec2f textureRight(cx+r*cos(a-da), cy-r*sin(a-da));
// Add the vertices to the VBO mesh to form a triangle
addFace(vboMeshOriginal, triangleBottom, triangleLeft, triangleRight);
addFace(vboMeshMirrored, triangleBottom, triangleLeft, triangleRight);
// Add the texture coordinates to the mesh
addTexture(vboMeshOriginal, textureBottom, textureLeft, textureRight);
addTexture(vboMeshMirrored, textureBottom, textureRight, textureLeft);
}
void UltraEyeRenderer::drawHenshinInstruction()
{
XuSkeletonJointInfo jrh, jh, jre;
m_henshinDetector->getUserDetector()->getSkeletonJointInfo(XU_SKEL_RIGHT_HAND, &jrh);
m_henshinDetector->getUserDetector()->getSkeletonJointInfo(XU_SKEL_HEAD, &jh);
m_henshinDetector->getUserDetector()->getSkeletonJointInfo(XU_SKEL_RIGHT_ELBOW, &jre);
if (!isConfident(jrh) || !isConfident(jh) || !isConfident(jre)) return;
const float CIRCLE_RADIUS = 100;
XV3 fv(m_henshinDetector->getUserDetector()->getForwardVector());
XV3 uv(m_henshinDetector->getUserDetector()->getUpVector());
XV3 armDirection((jrh.position - jre.position).normalize());
XV3 adjustedRightHand(jrh.position + armDirection * 30); // slightly move to the fingertip side
XV3 adjustedHead(jh.position + fv * 100); // slightly move forward
XV3 arrowTip(adjustedRightHand.interpolate(adjustedHead, 0.95f));
XV3 arrowBottom(adjustedRightHand.interpolate(adjustedHead, 0.0f));
float len = (arrowTip - arrowBottom).magnitude();
XV3 triangleBottom(arrowBottom.interpolate(arrowTip, 0.8f));
XV3 triangleOpening = (arrowTip - arrowBottom).cross(armDirection).normalize() * len * 0.1f;
XV3 arrowPlaneNorm = (arrowTip - arrowBottom).cross(triangleOpening).normalize();
XV3 triangleEnd1(triangleBottom + triangleOpening);
XV3 triangleEnd2(triangleBottom - triangleOpening);
float maxAlpha = cramp((len - 50.0f) / 150.0f, 0, 1);
float blinkSpeed = 1000.0f / std::max(len - 100.0f, 100.f);
m_phase += m_ticker.tick() * blinkSpeed;
float alpha = square(std::sin(m_phase)) * maxAlpha;
M3DVector4f arrowColor = { 0.7f, 0.0f, 0.0f, alpha };
m_rctx->shaderMan->UseStockShader(GLT_SHADER_FLAT, m_rctx->transform.GetModelViewProjectionMatrix(), arrowColor);
const float THICKNESS = 2;
glDisable(GL_DEPTH_TEST);
glLineWidth(getPointSize() * THICKNESS);
glPointSize(getPointSize() * THICKNESS);
glBegin(GL_LINES);
if (len > CIRCLE_RADIUS) {
glVertex3fv(XV3toM3D(arrowBottom + (arrowTip - arrowBottom).normalize() * CIRCLE_RADIUS));
glVertex3fv(XV3toM3D(arrowTip));
}
glVertex3fv(XV3toM3D(arrowTip));
glVertex3fv(XV3toM3D(triangleEnd1));
glVertex3fv(XV3toM3D(arrowTip));
glVertex3fv(XV3toM3D(triangleEnd2));
glEnd();
glBegin(GL_LINE_LOOP);
XV3 r0((arrowTip - arrowBottom).normalize() * CIRCLE_RADIUS);
GLFrame f;
f.SetForwardVector(0, 0, 1); // invert Z
const int SEGMENTS = 24;
const float STEP_ANGLE = float(M_PI * 2 / SEGMENTS);
for (int i = 0; i < SEGMENTS; i++) {
f.RotateLocal(STEP_ANGLE, arrowPlaneNorm.X, arrowPlaneNorm.Y, arrowPlaneNorm.Z);
M3DVector3f r;
f.TransformPoint(XV3toM3D(r0), r);
glVertex3fv(XV3toM3D(arrowBottom + r));
}
glEnd();
if (m_isNewUser) {
XV3 p(-0.95f, 0.80f, 0.0f), s(0.001f, 0.0015f, 1.0f);
renderStrokeText(m_rctx, "Put your Ultra Eye On! Now!", p, s, 3.0f, arrowColor);
}
glEnable(GL_DEPTH_TEST);
}
